dhclient taking up all CPU

[Spil Oss]

Hi all,

Been experiencing this same behaviour every now-and-then.

FreeBSD/i386 6.1-RELEASE-p10

Any solutions to this?

Kind regards,

Spil.

On 06/05/06, Lodewijk Vöge <lvoege at gmail.com> wrote:
> hello,
>
> a while ago someone reported the same problem I had been seeing, that
> dhclient starts taking up 100% CPU. it's probably something comcast
> is doing.
>
> I couldn't get the requested coredump then, if I set kern.corefile
> to /tmp/%N.core and kill -QUIT it, it doesn't seem to produce a
> coredump. but it happened again just now, and I was able to attach
> gdb. this is where it's spinning, in receive_packet() in bpf.c:
>
> (gdb)
> 285                     if (interface->rbuf_offset == interface-
>  >rbuf_len) {
> (gdb)
> 299                     if (interface->rbuf_len - interface-
>  >rbuf_offset <
> (gdb)
> 306                     memcpy(&hdr, &interface->rbuf[interface-
>  >rbuf_offset],
> (gdb)
> 313                     if (interface->rbuf_offset + hdr.bh_hdrlen +
> hdr.bh_caplen >
> (gdb)
> 320                     interface->rbuf_offset += hdr.bh_hdrlen;
> (gdb)
> 327                     if (hdr.bh_caplen != hdr.bh_datalen) {
> (gdb)
> 328                             interface->rbuf_offset =
> (gdb)
> 331                             continue;
> (gdb)
> 385             } while (!length);
>
> and then it goes back to line 285. interesting variables are:
>
> (gdb) p *interface
> $1 = {next = 0x0, hw_address = {htype = 1 '\001', hlen = 6 '\006',
>     haddr = "\000\021ؠ\223?\000\000\000\000\000\000\000\000\000"},
> primary_address = {s_addr = 0},
>   name = "vr0", '\0' <repeats 12 times>, rfdesc = 7, wfdesc = 7,
> rbuf = 0x807d000 "\022?\\Dk\214", rbuf_max = 4096,
>   rbuf_offset = 416, rbuf_len = 415, ifp = 0x806f160, client =
> 0x8075000, noifmedia = 0, errors = 0, dead = 0, index = 2}
> (gdb) p length
> $2 = 0
> (gdb) p hdr
> $3 = {bh_tstamp = {tv_sec = 0, tv_usec = 0}, bh_caplen = 4294901760,
> bh_datalen = 4294901778, bh_hdrlen = 65535}
>
> this is FreeBSD/i386 6.1-RC as of about two weeks ago.
>
> Lodewijk
>
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